On Sun, Aug 18, 2013 at 06:04:55PM +0200, Johnny Billquist wrote:
> Looking at 2.11BSD, it looks like this:
>
> struct direct {
> [snip]
>
> In NetBSD (fairly current):
>
> struct dirent {
careful, you want struct direct, not struct dirent:
struct direct {
u_int32_t d_fileno; /* inode number of entry */
u_int16_t d_reclen; /* length of this record */
u_int8_t d_type; /* file type, see below */
u_int8_t d_namlen; /* length of string in d_name */
char d_name[FFS_MAXNAMLEN + 1];/* name with length <=
FFS_MAXNAMLEN */
};
not that it's actually much different.
> It's an obvious optimization to keep type already in the directory
> itself. But is there any other reason why it was added there?
Speed. There's a moderately famous paper "A trace-driven analysis of
the UNIX 4.2 BSD file system" -- you might have heard of it :-)
--
David A. Holland
dholl...@netbsd.org
